// console.log('Object is what ?');
var o = {"a":1};
const num = 0.01;
let b;
console.log(o.toString());
console.log(typeof num);// 前三位表示类型 000
console.log(Object.prototype.isPrototypeOf(o),'-----');
console.log(o.hasOwnProperty("a"),'/////');
console.log(o.hasOwnProperty("a"),'/////');